Definition of cislunar
: lying between the earth and the moon or the moon's orbit
- cislunar space
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Recent Examples of cislunar from the Web
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The space agency has spent the last decade building the Space-Launch System and Orion, a rocket and spacecraft intended to carry people into deep space but also to build a cislunar way station called the Deep-Space Gateway.
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Step two involves the international spaceflight community coming together to build cyclers that ply cislunar space, taking people on trips to the moon and back.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cislunar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of cislunar
circa 1877
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